/*
 * Copyright (C) 2011-2014 GUIGUI Simon, fyhertz@gmail.com
 *
 * This file is part of libstreaming (https://github.com/fyhertz/libstreaming)
 *
 * Spydroid is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package net.majorkernelpanic.streaming.rtp;

import java.io.IOException;

import android.annotation.SuppressLint;
import android.media.MediaCodec.BufferInfo;
import android.util.Log;

/**
 * RFC 3640.
 * <p>
 * Encapsulates AAC Access Units in RTP packets as specified in the RFC 3640.
 * This packetizer is used by the AACStream class in conjunction with the
 * MediaCodec API introduced in Android 4.1 (API Level 16).
 */
@SuppressLint("NewApi")
public class AACLATMPacketizer extends AbstractPacketizer implements Runnable {

    private final static String TAG = "AACLATMPacketizer";

    private Thread t;

    public AACLATMPacketizer() {
        super();
        socket.setCacheSize(0);
    }

    public void start() {
        if (t == null) {
            t = new Thread(this);
            t.start();
        }
    }

    public void stop() {
        if (t != null) {
            try {
                is.close();
            } catch (IOException ignore) {
            }
            t.interrupt();
            try {
                t.join();
            } catch (InterruptedException e) {
            }
            t = null;
        }
    }

    public void setSamplingRate(int samplingRate) {
        socket.setClockFrequency(samplingRate);
    }

    @SuppressLint("NewApi")
    public void run() {

        Log.d(TAG, "AAC LATM packetizer started !");

        int length = 0;
        long oldts;
        BufferInfo bufferInfo;

        try {
            while (!Thread.interrupted()) {
                buffer = socket.requestBuffer();
                length = is.read(buffer, rtphl + 4, MAX_PACKET_SIZE - (rtphl + 4));

                if (length > 0) {

                    bufferInfo = ((MediaCodecInputStream) is).getLastBufferInfo();
                    //Log.d(TAG,"length: "+length+" ts: "+bufferInfo.presentationTimeUs);
                    oldts = ts;
                    ts = bufferInfo.presentationTimeUs * 1000;

                    // Seems to happen sometimes
                    if (oldts > ts) {
                        socket.commitBuffer();
                        continue;
                    }

                    socket.markNextPacket();
                    socket.updateTimestamp(ts);

                    // AU-headers-length field: contains the size in bits of a AU-header
                    // 13+3 = 16 bits -> 13bits for AU-size and 3bits for AU-Index / AU-Index-delta
                    // 13 bits will be enough because ADTS uses 13 bits for frame length
                    buffer[rtphl] = 0;
                    buffer[rtphl + 1] = 0x10;

                    // AU-size
                    buffer[rtphl + 2] = (byte) (length >> 5);
                    buffer[rtphl + 3] = (byte) (length << 3);

                    // AU-Index
                    buffer[rtphl + 3] &= 0xF8;
                    buffer[rtphl + 3] |= 0x00;

                    send(rtphl + length + 4);

                } else {
                    socket.commitBuffer();
                }

            }
        } catch (IOException e) {
        } catch (ArrayIndexOutOfBoundsException e) {
            Log.e(TAG, "ArrayIndexOutOfBoundsException: " + (e.getMessage() != null ? e.getMessage() : "unknown error"));
            e.printStackTrace();
        } catch (InterruptedException ignore) {
        }

        Log.d(TAG, "AAC LATM packetizer stopped !");

    }

}
